Topic: 2227161 Master Cylinder Variations

[67gtasanjose]

In addition to my last comment on an aftermarket alternative, I have located a few images of the Stop Bolts, the Allen or button version and the 1/2" wrench hex bolt version. There has been discussion of a 3rd style but I haven't found any pictures of it yet.

Two points I wish to make with this comment. 1.) You can switch out an incorrect stop bolt if it is the wrong one (though you MUST disassemble the cylinder to secure the lower piston beyond the stop bolt if you switch it) and
2.) A person MIGHT find a cylinder with the correct 2227161 casting that does not have a stop bolt (later versions) and machine the area and drill a shallow hole, thread the hole and insert a shortened version of the stop bolt in the correct location, thus SIMULATING a stop bolt in a newer casting.

[Bossbill]

Richard -- are these stop bolts in your possession?

Another user PMed with the size of his stop bolt and according to our measurements the large button head stop bolt will not interchange with the small hex head stop bolt.

I believe the large button head stop bolt will interchange with the large hex head stop bolt.

[67gtasanjose]

Richard -- are these stop bolts in your possession?

Another user PMed with the size of his stop bolt and according to our measurements the large button head stop bolt will not interchange with the small hex head stop bolt.

I believe the large button head stop bolt will interchange with the large hex head stop bolt.

No. An ebay seller's. I figured they may be helpful to the discussion.

[Mike_B_SVT]

2.) A person MIGHT find a cylinder with the correct 2227161 casting that does not have a stop bolt (later versions) and machine the area and drill a shallow hole, thread the hole and insert a shortened version of the stop bolt in the correct location, thus SIMULATING a stop bolt in a newer casting.

This is what I've been considering.  My MC has no stop bolt, but appears to have some sort of pin and epoxy in the hole.
Wonder if I could just epoxy the top of a button-head bolt onto the bottom of the MC and call it good >.>

[196667Bob]

I doubt that the epoxied pin was original to that MC. My guess is that the original stop bolt was lost, or broken, and someone just epoxied a pin in there to act as a stop bolt. Possibly you could just remove the pin, rethread it for 1/4-28, and put the correct stop bolt in ?

Bob

[67350#1242]

Reproductions available as mentioned earlier:

http://therammaninc.com/products/shop_list/Disc-Master-Cylinders-345

[67350#1242]

Attached are photos of 3 different fine threaded stop bolts I have found.   Appears there are fine thread 3/8" as well as 1/2" and button headed allen.   Notice the flattened out top of this button headed bolt.

[67gtasanjose]

Attached are photos of 3 different fine threaded stop bolts I have found.   Appears there are fine thread 3/8" as well as 1/2" and button headed allen.   Notice the flattened out top of this button headed bolt.

The THREADS of the bolts pictured, ALL look to be the same size & pitch. Do you have a way to measure each thead size and thread pitch? NONE look to be fine thread pitch from what I am seeing in your pictures.

[67350#1242]

The THREADS of the bolts pictured, ALL look to be the same size & pitch. Do you have a way to measure each thread size and thread pitch? NONE look to be fine thread pitch from what I am seeing in your pictures.

Yes all 3 are same threads.  I don't have a thread gauge,  but all 3 thread into the master cylinder that the center (3/8 head) bolt came from.  I'm pretty sure this is the 1/4-28 size as referred to earlier.
I also have a master with the larger stop bolt (5/16-18?) and these are too small to thread into it.
The 1/2" flats bolt and the button head bolt came from NOS Ford master cyl. kits - so may not have been assembly line style.